Opinions vary widely when it comes to the subject of trimming or clipping a bird's wings. Some bird owners strongly oppose the idea, while others feel it is an acceptable tradeoff because it gives the bird much more freedom outside of his cage. If you let your bird fly freely around the house, he could get into serious trouble with obstacles like ceiling fans, aside from escaping through open windows and doors.
Clipping his wings greatly reduces his exposure to these hazards and also prevents your bird from perching in high, inaccessible places. Also, a bird with clipped wings is easier to tame but that does not mean it has to be clipped it's entire life.
However, it should be noted that trimming his wings seriously handicaps his ability to escape from threatening situations such as the family cat. Ultimately, you must make the decision based on what you feel is best for you and your bird. Wing trimming is a fairly simple process, but you will most likely need a helper to hold the bird while you cut the feathers.
If you are unsure about trimming your bird's wings yourself, or have never done it before, contact someone who is experienced in clipping like an avian veterinarian or bird breeder who can do the task for you or show you how to do it your self. Often, if you have no experience trimming wings, it is best for you to watch someone else do it a few times or simply pay them to do it regularly.
Eventually, if you are confident that you are able to trim your bird's wings yourself, you'll need to have a friend or family member to hold the bird, sharp scissors, a means of restraining your bird (such as a towel), tweezers or needle nose pliers to remove accidentally cut blood feathers, and flour or corn starch to be used to stop bleeding.
Some bird owners want flight control for a shorter period of time, and resort to outright plucking of the flight feathers. They might consider plucking as the easiest, fastest way to render a bird immobile, but this is very painful for the bird and should absolutely not be considered!